serious brake problem
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serious brake problem
my 78 f-250 has got a serious brake problem. when you step on the pedal it does nothing but when you let off and pump it again there is brakes and the more you pump the better they get. could this be brake booster leaking. by the way when i shut the truck off i can heara vacumm leak under the hood close to the booster
Postmaster
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Fixing the vacuum leak, first a vacuum line could be broken, check all vacuum lines for bad connection and if line is cracked. Then verify if the power booster is leaking. With a set of vice grips squeeze the hose that runs to the power booster and check if you can still hear a vacuum leak. This a quick test to determine if its leaking.
The reason your pedal is going to the floor is you need to replace the brake master cylinder mounted on the power booster.
The reason your pedal is going to the floor is you need to replace the brake master cylinder mounted on the power booster.
Postmaster
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Originally Posted by nick88f150
Other than the vacuum leak, I have the same problem, no braking power at all. I replaced the mas. cyl., both calipers and rear cyl's. Bled them all and still nothin, anyone got an idea?
Are your brake caliber bleeder valves facing upwards?
Postmaster
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Originally Posted by 78 Ranger
my 78 f-250 has got a serious brake problem. when you step on the pedal it does nothing but when you let off and pump it again there is brakes and the more you pump the better they get. could this be brake booster leaking. by the way when i shut the truck off i can heara vacumm leak under the hood close to the booster
Posting Guru
Joined: Feb 2004
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From: fremont ohio
Originally Posted by 1975Ford
Did you bench bled the master cylinder off the truck?
Are your brake caliber bleeder valves facing upwards?
Are your brake caliber bleeder valves facing upwards?
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Laughing Gas
Joined: Aug 2004
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From: Roseburg, OR
To both nick88f150 and 78 Ranger:
Does the pedal go all the way to the floor? Or do you have good pedal pressure with poor stopping power?
In 78 Ranger's case, it definitely sounds like the master cylinder.
But in nick88f150's case, if it was pushing clean fluid out the bleeders... doesn't seem like it would go to the floor...
Does the pedal go all the way to the floor? Or do you have good pedal pressure with poor stopping power?
In 78 Ranger's case, it definitely sounds like the master cylinder.
But in nick88f150's case, if it was pushing clean fluid out the bleeders... doesn't seem like it would go to the floor...
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Posting Guru
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From: fremont ohio
In that picture...the 2 bolts is where the mas. cyl connects right? So that adjustment is right behind that then? I think that may be my problem, the pedal goes all the way to the floor, but right before it hits the end of the pedal travel, the brakes begin to stop me. Good thing I'm at school for machining, I'll hafta pull out the calipers tonight and get it in range if it isn't ....thanks a bunch.
Post Fiend
Joined: Mar 2002
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From: Bonita Springs FL
Nick, even if you have the same problem, you REALLY need to start a seperate thread. It's already very confusing to follow.
78 Ranger - it sounds to me like your rear shoes are way out of adjustment.
78 Ranger - it sounds to me like your rear shoes are way out of adjustment.
Postmaster
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The brake caliper installed correctly should look like this.
and the brake caliper installed wrong, and should not look like this.
You never mentioned pulling the pin on the Porportion Valve (PV) first ?
With an F250/ 350 over 6800 GVWR the pin is supposed to stay in.
and the brake caliper installed wrong, and should not look like this.
You never mentioned pulling the pin on the Porportion Valve (PV) first ?
With an F250/ 350 over 6800 GVWR the pin is supposed to stay in.